LSE Lighting compatible UV Bulb 33W for Neptune TRI-12 WTA4-739 Brand: LSE Lighting - Type: Ultraviolet Germicidal UV Bulb 254nm UV-C Wattage: 33W - Length: approx 29" Lamp Shape: T5 - Base: 4pin (4pins ON ONE END) - Warranty: 1 year This replacement UV Bulb by (LSE Lighting) brand is 100% compatible for use with Neptune Water Treatment Models TRI-12 WTA4-739. All UV replacement lamps listed are compatible brand (LSE Lighting) UV products. We do not sell Neptune / Water Treatment & Accessories brand UV lamps. All Neptune / Water Treatment & Accessories brand names, trademarks and logos are property of Neptune / Water Treatment & Accessories.